A 55-kg packing crate is pulled with constant speed across arough floor with a r

Question

A 55-kg packing crate is pulled with constant speed across arough floor with a rope that is at an angle of 42.6degrees above the horizontal. If the tension in the ropeis 155 Newtons, how much work is done on the crate to move it 7.0m.Express answer in Joules. A 55-kg packing crate is pulled with constant speed across arough floor with a rope that is at an angle of 42.6degrees above the horizontal. If the tension in the ropeis 155 Newtons, how much work is done on the crate to move it 7.0m.Express answer in Joules.

Explanation / Answer

mass m = 55 kg angle = 42.6 degrees tension T = 155 N distance S = 7 m required work done W = T cos * S     Since it moves with constantspeed i.e., net force is zero that meansfrictional                                                                      force is equal to force act on forward direction                                    = 798.66 J

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